#7684 Add self-build Dockerfile

[planetf1]

Description

provides a new Dockerfile (in addition to existing) which will

• Download/extract source from github
• Build egeria using gradle
• Allow egeria to be launched as before (end result is identical)
• Adds docs on build & runtime parameters

A dockerfile can be built directly using only this new single Dockerfile.selfbuild - and there is no requirement to build egeria in advance, nor copy files around. This may make it easier for developers, it can be built directly on dockerhub, and easily fit into a ci/cd process

Of course organization processes will vary, so it ultimately just forms another example of how one could build an image

Fixes #7684

Related Issue(s)

Testing

• Built and run with docker build -t planetf1/egeria:selfbuild1 -f ./Dockerfile.selfbuild . && docker run docker.io/planetf1/egeria:selfbuild1
• Not tested all optional parameters

Release Notes & Documentation

If we think it's useful, we should add content to the release notes once we've had a chance to review/try it out

Additional notes

cc: @dwolfson @lpalashevski @mandy-chessell

In future may want to consider

• Additional configurability ie
  • Adding or removing components
  • Adding in external connectors (currently we do this only in the k8s charts)

We might also be able to build directly from a git url - see https://docs.docker.com/engine/reference/commandline/build/
However I could not get this working with rancher desktop. Also our dockerfile is deep in the directory tree, and has an alternative name. May need refactoring

I offer it as an example, a starting point for further ideas